I think the author forgot about our MC are still in elementary school,
and he just put any isekai things into the story, like dragons, adventure and other dangerous things
@IreneStan
I think this is a pretty good start,
rather than the typical start where you reincarnate or remember past memories then suddenly get a something cheat shit and in the next chapter you immediately meet the heroine, just like in the usual Isekai manga.